<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			span.open {
				color: red;
			}
		</style>
	</head>
	<body>
		<!-- 交集选择器 -->
		<span class="open">呼呼呼</span>
		<p class="open">哈哈哈</p>
	</body>
</html>